Acne scars are not a single condition. They are a heterogeneous group of skin changes — atrophic, hypertrophic, pigmented, vascular — each with a different pathogenesis and a different optimal treatment. The single most common reason acne scar treatment fails is the wrong treatment for the wrong scar type. This guide maps the treatment landscape by scar classification.
Atrophic Scars — The Most Common Type
Atrophic scars result from insufficient collagen deposition during wound healing, leaving a depression in the skin surface. There are three subtypes. Ice pick scars are narrow, deep, V-shaped depressions that extend into the dermis — the hardest to treat because their depth exceeds what surface-level remodelling can reach. The most effective treatment is TCA cross (trichloroacetic acid applied into the base of the scar to stimulate fibrosis and elevation), sometimes combined with punch excision. Boxcar scars are broad, U-shaped depressions with defined edges — more amenable to surface remodelling. MNRF, fractional CO2 laser, and subcision (cutting the fibrotic tethers beneath the scar to allow elevation) are effective. Rolling scars are broad, undulating depressions with poorly defined edges caused by fibrous tethering beneath the skin surface. Subcision combined with filler or MNRF produces excellent results by addressing the subdermal tethering that creates the rolling appearance.
Hypertrophic and Keloid Scars
Hypertrophic scars (raised but contained within the original wound boundaries) and keloids (raised and extending beyond the wound) result from excessive collagen deposition. Treatment: intralesional corticosteroid injections to flatten and soften the scar, sometimes combined with 5-fluorouracil; silicone sheets for ongoing compression; pulsed dye laser to reduce vascularity and redness; and for keloids, careful surgical excision followed by steroid injections and/or radiotherapy to prevent regrowth.
Post-Inflammatory Hyperpigmentation
PIH is not technically scarring — it is residual pigmentation from inflammation, which fades with time and appropriate treatment. Topical depigmenting agents, chemical peels, and Q-switched laser address pigmentation effectively. Treating PIH as structural scarring (with aggressive procedures) risks further PIH and worsens the problem. The correct approach: sun protection, topical maintenance, and patience.
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— Dr. Nishita Ranka | Consultant Dermatologist | Dr. Nishita’s Clinic for Skin, Hair & Aesthetics, Hyderabad
